LB1847-E

Overview

The LB1847-E is a monolithic digital integrated circuit designed as a PWM current control type stepping motor driver. It utilizes a bipolar drive method with fixed OFF time to manage stepper motors ranging from 1-2 phase exciter types to 4W 1-2 phase exciter types. The device features a constant VREF voltage while allowing current setting in 15 distinct steps. It supports selectable current decay patterns, including SLOW DECAY, FAST DECAY, and MIX DECAY, to optimize regenerative current chopping. The IC operates within a supply voltage range of 10V to 45V and is housed in a 28-pin SDIP package.

Feature Summary

• PWM current control with bipolar drive for precise stepping motor management
• Adjustable current settings across 15 discrete steps via constant VREF voltage
• Selectable current decay patterns (SLOW, FAST, MIX) to enhance response characteristics
• Integrated design supporting various exciter types from 1-2 phase to 4W 1-2 phase

Applications

• Carriage stepping motors in printers
• Paper feed stepping motors in printing equipment
• Applications requiring high-precision motion control
• Systems demanding low vibration operation

Procurement Notes

Verify the specific ordering suffix against official onsemi documentation to confirm package type and temperature rating. Ensure the selected variant matches the required DIP or SDIP configuration. Cross-reference the part number with the latest datasheet revision to confirm compliance with RoHS standards and availability status. Confirm that the 10V to 45V operating range aligns with the target system power supply specifications before procurement.

Selection Notes

Select this component when designing systems requiring precise current regulation for bipolar stepper motors. The fixed OFF time and adjustable current steps make it suitable for applications needing stable torque without complex external feedback loops. Consider the available decay modes if rapid stopping or reduced resonance is critical. Verify that the 28-pin package footprint fits the PCB layout constraints and that the thermal performance meets the ambient operating conditions.

Part Context

The LB1847 belongs to onsemi's family of monolithic digital ICs dedicated to motor control. It is specifically engineered for stepping motor drivers, distinguishing itself through PWM current control capabilities. This series targets industrial and office automation equipment where reliable, high-precision motor driving is essential. The LB1847 provides a complete solution for bipolar drive requirements within a single chip architecture.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.